diff --git a/.coveragerc b/.coveragerc
new file mode 100644
index 0000000..e4b98aa
--- /dev/null
+++ b/.coveragerc
@@ -0,0 +1,12 @@
+[run]
+command_line=-m pytest
+omit=
+	*_js.py
+	pyRCV2/transcrypt.py
+source=pyRCV2
+
+[report]
+exclude_lines=
+	__pragma__
+	def __repr__
+	pragma: no cover
diff --git a/.gitignore b/.gitignore
index fe4698c..7eb9203 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,8 @@
+/.coverage
 /.python-version
 /__target__
-/test
 /html/bundle.js
+/htmlcov
+/test
 __pycache__
 .~*
diff --git a/pyRCV2/method/base_stv.py b/pyRCV2/method/base_stv.py
index be23488..1e7d456 100644
--- a/pyRCV2/method/base_stv.py
+++ b/pyRCV2/method/base_stv.py
@@ -142,7 +142,7 @@ class BaseSTVCounter:
 		if result:
 			return result
 		
-		raise STVException('Unable to complete step')
+		raise STVException('Unable to complete step') # pragma: no cover
 	
 	def step_count_cards(self):
 		"""
@@ -249,7 +249,7 @@ class BaseSTVCounter:
 					has_surplus.sort(key=lambda x: x[1].votes, reverse=True)
 				elif self.options['surplus_order'] == 'order':
 					has_surplus.sort(key=lambda x: x[1].order_elected)
-				else:
+				else: # pragma: no cover
 					raise STVException('Invalid surplus order option')
 				
 				# Attempt to defer all remaining surpluses if possible
@@ -286,7 +286,7 @@ class BaseSTVCounter:
 		Transfer the surplus of the given candidate
 		Subclasses must override this function
 		"""
-		raise NotImplementedError('Method not implemented')
+		raise NotImplementedError('Method not implemented') # pragma: no cover
 	
 	def before_exclusion(self):
 		"""
@@ -440,7 +440,7 @@ class BaseSTVCounter:
 		Exclude the given candidate and transfer the votes
 		Subclasses must override this function
 		"""
-		raise NotImplementedError('Method not implemented')
+		raise NotImplementedError('Method not implemented') # pragma: no cover
 	
 	def compute_quota(self):
 		"""
@@ -457,7 +457,7 @@ class BaseSTVCounter:
 			elif self.options['quota'] == 'hare' or self.options['quota'] == 'hare_exact':
 				self.quota = self.total / Num(self.election.seats)
 			else:
-				raise STVException('Invalid quota option')
+				raise STVException('Invalid quota option') # pragma: no cover
 			
 			if self.options['round_quota'] is not None:
 				if self.options['quota'] == 'droop' or self.options['quota'] == 'hare':
@@ -501,7 +501,7 @@ class BaseSTVCounter:
 			return count_card.votes > self.quota or (self.options['quota_mode'] == 'ers97' and count_card.votes > self.vote_required_election)
 			__pragma__('noopov')
 		else:
-			raise STVException('Invalid quota criterion')
+			raise STVException('Invalid quota criterion') # pragma: no cover
 	
 	def elect_meeting_quota(self):
 		"""
diff --git a/pyRCV2/method/gregory.py b/pyRCV2/method/gregory.py
index 91835ea..8a47100 100644
--- a/pyRCV2/method/gregory.py
+++ b/pyRCV2/method/gregory.py
@@ -31,7 +31,7 @@ def groupby(iterable, keyfunc):
 		import itertools
 		return [list(g) for k, g in itertools.groupby(iterable, keyfunc)]
 		__pragma__('noskip')
-	else:
+	else: # pragma: no cover
 		groups = []
 		group = []
 		last_result = None
@@ -173,7 +173,7 @@ class WIGSTVCounter(BaseSTVCounter):
 				# TODO: Can we combine ballots for each candidate within each stage?
 				self._exclusion = (candidates_excluded, [[(c, [(b, bv)]) for c, b, bv in x] for x in ballots_by_value])
 			else:
-				raise STVException('Invalid exclusion mode')
+				raise STVException('Invalid exclusion mode') # pragma: no cover
 		
 		this_exclusion = self._exclusion[1][0]
 		self._exclusion[1].remove(this_exclusion)
diff --git a/pyRCV2/model.py b/pyRCV2/model.py
index 80935d5..22dd454 100644
--- a/pyRCV2/model.py
+++ b/pyRCV2/model.py
@@ -25,7 +25,7 @@ class Candidate:
 	def __repr__(self):
 		return '<Candidate ' + self.name + '>'
 	
-	def toString(self):
+	def toString(self): # pragma: no cover
 		return repr(self)
 
 class CandidateState:
diff --git a/pyRCV2/numbers/__init__.py b/pyRCV2/numbers/__init__.py
index b01ea40..4ff3ae9 100644
--- a/pyRCV2/numbers/__init__.py
+++ b/pyRCV2/numbers/__init__.py
@@ -26,7 +26,7 @@ if is_py:
 	from pyRCV2.numbers.native_py import Native
 	from pyRCV2.numbers.rational_py import Rational
 	__pragma__('noskip')
-else:
+else: # pragma: no cover
 	from pyRCV2.numbers.fixed_js import Fixed, set_dps, get_dps
 	from pyRCV2.numbers.native_js import Native
 	from pyRCV2.numbers.rational_js import Rational
diff --git a/pyRCV2/numbers/base.py b/pyRCV2/numbers/base.py
index 423c1c5..1cd7563 100644
--- a/pyRCV2/numbers/base.py
+++ b/pyRCV2/numbers/base.py
@@ -36,7 +36,7 @@ def compatible_types(f):
 		else:
 			return f
 		__pragma__('noskip')
-	else:
+	else: # pragma: no cover
 		# FIXME: Do we need to perform type checking in JS?
 		return f
 
@@ -61,7 +61,7 @@ class BaseNum:
 		Internal use: Convert the given value to an impl
 		Subclasses must override this method
 		"""
-		raise NotImplementedError('Method not implemented')
+		raise NotImplementedError('Method not implemented') # pragma: no cover
 	
 	@classmethod
 	def _from_impl(cls, impl):
@@ -79,52 +79,52 @@ class BaseNum:
 		Pretty print to specified number of decimal places
 		Subclasses must override this method
 		"""
-		raise NotImplementedError('Method not implemented')
+		raise NotImplementedError('Method not implemented') # pragma: no cover
 	
 	# Implementation of arithmetic on impls
 	# Subclasses must override these functions:
 	
 	@classmethod
 	def _add_impl(cls, i1, i2):
-		raise NotImplementedError('Method not implemented')
+		raise NotImplementedError('Method not implemented') # pragma: no cover
 	@classmethod
 	def _sub_impl(cls, i1, i2):
-		raise NotImplementedError('Method not implemented')
+		raise NotImplementedError('Method not implemented') # pragma: no cover
 	@classmethod
 	def _mul_impl(cls, i1, i2):
-		raise NotImplementedError('Method not implemented')
+		raise NotImplementedError('Method not implemented') # pragma: no cover
 	@classmethod
 	def _truediv_impl(cls, i1, i2):
-		raise NotImplementedError('Method not implemented')
+		raise NotImplementedError('Method not implemented') # pragma: no cover
 	
 	@compatible_types
 	def __eq__(self, other):
-		raise NotImplementedError('Method not implemented')
+		raise NotImplementedError('Method not implemented') # pragma: no cover
 	@compatible_types
 	def __ne__(self, other):
 		return not (self.__eq__(other))
 	@compatible_types
 	def __gt__(self, other):
-		raise NotImplementedError('Method not implemented')
+		raise NotImplementedError('Method not implemented') # pragma: no cover
 	@compatible_types
 	def __ge__(self, other):
-		raise NotImplementedError('Method not implemented')
+		raise NotImplementedError('Method not implemented') # pragma: no cover
 	@compatible_types
 	def __lt__(self, other):
-		raise NotImplementedError('Method not implemented')
+		raise NotImplementedError('Method not implemented') # pragma: no cover
 	@compatible_types
 	def __le__(self, other):
-		raise NotImplementedError('Method not implemented')
+		raise NotImplementedError('Method not implemented') # pragma: no cover
 	
 	def __pow__(self, power):
-		raise NotImplementedError('Method not implemented')
+		raise NotImplementedError('Method not implemented') # pragma: no cover
 	
 	def round(self, dps, mode):
 		"""
 		Round to the specified number of decimal places, using the ROUND_* mode specified
 		Subclasses must override this method
 		"""
-		raise NotImplementedError('Method not implemented')
+		raise NotImplementedError('Method not implemented') # pragma: no cover
 	
 	# Implement various data model functions based on _*_impl
 	
diff --git a/pyRCV2/random/__init__.py b/pyRCV2/random/__init__.py
index cc5772d..f146ce3 100644
--- a/pyRCV2/random/__init__.py
+++ b/pyRCV2/random/__init__.py
@@ -24,5 +24,5 @@ if is_py:
 	__pragma__('skip')
 	from pyRCV2.random.sharandom_py import SHARandom
 	__pragma__('noskip')
-else:
+else: # pragma: no cover
 	from pyRCV2.random.sharandom_js import SHARandom
diff --git a/pyRCV2/safedict/__init__.py b/pyRCV2/safedict/__init__.py
index 40b3b7e..1fc4814 100644
--- a/pyRCV2/safedict/__init__.py
+++ b/pyRCV2/safedict/__init__.py
@@ -24,5 +24,5 @@ if is_py:
 	__pragma__('skip')
 	from pyRCV2.safedict.safedict_py import SafeDict
 	__pragma__('noskip')
-else:
+else: # pragma: no cover
 	from pyRCV2.safedict.safedict_js import SafeDict
diff --git a/pyRCV2/ties.py b/pyRCV2/ties.py
index f35673c..7453e85 100644
--- a/pyRCV2/ties.py
+++ b/pyRCV2/ties.py
@@ -22,7 +22,8 @@ __pragma__('noskip')
 
 from pyRCV2.random import SHARandom
 
-class RequireInput(Exception):
+class RequireInput(Exception): # pragma: no cover
+	# For JS only
 	# Exceptions for control flow? In my code? It's more likely thank you think!
 	def __init__(self, message):
 		self.message = message
@@ -51,7 +52,7 @@ class TiesPrompt:
 			print()
 			
 			return l[i - 1]
-		else:
+		else: # pragma: no cover
 			if self.buffer is not None:
 				try:
 					choice = int(self.buffer)
diff --git a/requirements.txt b/requirements.txt
index 89918da..ffcc411 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,8 +1,9 @@
 # Dependencies
-Transcrypt==3.7.16
+coverage==5.3.1
 py-mini-racer==0.4.0
 pytest==6.2.1
 pytest-steps==1.7.3
+Transcrypt==3.7.16
 
 # Dependency tree
 attrs==20.3.0